Not to worry, we've got 2112 and 387. Let's get to adding them!

Step 1: We'll start by adding the digits 2 & 7 in column 1 and get 9.

Step 2: We'll start by adding the digits 1 & 8 in column 2 and get 9.

Step 3: We'll start by adding the digits 1 & 3 in column 3 and get 4.

Step 4: We'll start by adding the digits 2 & 0 in column 4 and get 2.

So, 2112 + 387 = 2499.

